How many watts are in a horsepower?

1 hp = 745.7 W. To convert any amount, multiply by 745.7.

How do you convert horsepower to watts?

Multiply the number of horsepower by 745.7 to get watts. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Power

Horsepower to watts converter

Convert horsepower (hp) to watts (W). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert horsepower to watts— the formula

Horsepower convert to watts by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

W = hp × 745.7

hp = W × 0.001341

Watt: SI derived. 1 hp (mechanical) = 745.6998715822702 W; 1 BTU/hr = 0.29307107 W (NIST SP 811).

Questions

Frequently asked questions

How many watts are in a horsepower?
1 hp = 745.7 W. To convert any amount, multiply by 745.7.
How do you convert horsepower to watts?
Multiply the number of horsepower by 745.7 to get watts. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.